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N. N. Petropavlov; N. F. Kostin; G. A. Ermakova; B. V. Shemeryankin; O. V. Messinova; N. N. Rattél'. (1975). Polymorphism of hydrocortisone. , 9(7), 459–461. doi:10.1007/bf00759355 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research